Air-pump-actuating device for steam-engines.



No. 746,373; PATENTED DEC. s, 1903.

G. B. PETSGHE.

AIR PUMP AGTUATING DEVICE FOR. STEAM ENGINES.

APPLICATION FILED APR.17, 1903.

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No. 746,373. PATENTED DEC. 8, 1903. G. B. PETSGHE.

AIR PUMP ACTUATI'NG DEVICE FOR STEAM ENGINES. APPLICATION FILED APR. 17,1903 N0 MODEL. 2 SHBBTs-SHEBT 2.

flnz'g aslre; ////ra/ UNITED STATES Patented December 8, 1903.

PATENT OFFICE.

GUSTAV BERNHARD PETSCHE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THESOUTHWARK FOUNDRY & MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, ACORPORATION OF PENN- SYLVANIA.

AlR-PUMP-ACTUATING DEVICE FORSTEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 746,373, dated December8, 1903.

Application filed April 17, 1903. Serial No. 163,042. (No model.)

To aZZ whom it may concern:

Be it known that I, GUsTAv BERNHARD PETSOHE, a subject of the Emperor ofGermany,residing in the city and county of Philadelphia, in the State ofPennsylvania, have invented a certain new and useful Improvement inAir-Pump-Actuating Devices for Steam- Engines, of which the following isatrue and exact description, reference being had to the accompanyingdrawings, which form a part thereof.

My invention relates to devices for actuating air-pumps connected withsteam-engines; and it consists of a parallel-motion construction wherebythe piston of an air-pump of any diameter can be actuated and wherebythe use of guide-bearings other than those incident to the ordinaryconstruction of the steamengine is made unnecessary.

The nature of my improvements will be best understood as described inconnection with the drawings, in which they are illustrated, and inwhich- Figure 1 is a side elevation of an engine equipped with myimprovement, and Fig. 2a front elevationthereof. I

A indicates the base of the engine, having an extension, (indicated atA,) upon which the air-pump cylinder can be placed, saidextension-platform being of such dimensions as to permit of itsreceiving and supporting cylinders of differing diameter.

B B indicate the housings and supports for the engine-cylinders and areformed'with lateral extensions (indicated at B) for purposes to beexplained.

C indicates the engine-cylinder; C, the valve-box; D, the steam-conduitleading to the valve-box and embodying, as shown, a governingyalve.

Eindicates the weights of the governor; E,

a friction-disk connected with the governorspindle by mechanism, (notshown,) said governor-disk being actuated by contact with a secondfriction-disk (indicated at E and secured on the spindle E which issupported on the arm E of a bell-crank lever pivoted at E and having itsother arm E connected for adjustment with a spindle E, E indicating aregulating-screw.

e is a beltwheel on the spindle E which is connected by a belt F with apulley F on the shaft G of the engine.

H is the valve-spindle, pivoted at H to a swinginglink H pivoted at K,and also to a link H connected with an eccentric on the shaft G, whichis indicated at H I is the piston-rod of the steam-engine, which ispivotally connected with the crosshead 7 to which is also pivotallyconnected the connecting-rod I, the other end of which is connected withthe crank-pin I and crankarm I secured on shaft G.

J indicates the air-pump cylinder; J, the admission-conduit leadingthereto; J the eX- haust-conduit.

J is a valve-spindle connected with the valve (not shown) in the conduitJ and actuated through a lever-arm J 4 and connecting-rodJ by'aneccentric J G on the shaft.

J 7 is'the piston-rod of the air-pump cylinder.

K-is apivot secured on the brackets B B and supporting the fulcrum-lever, having arms K and K supporting pivot-pins itand L is a beampivoted on the pivot-pin 7c and also pivotally connected at the end ofits arm L With thecross-head 2', the arm L of the beam supporting thepivot, (indicated at Z.)

M is a connecting-link pivoted to the fulcrum-lever at 70 and equal ineffective length to the length of the beam-arm L. The outer end of thelink M is pivoted at m to the link N, the effective length of which isequal to the effective length of the fulcrumlever. Also pivoted at m isa head 0, which is secured to and in effect forms a part of thepiston-rod J It will be at once obvious that the motion communicatedfrom the cross-head ito the pivot m is a parallel motion and that theessential constructive feature of the device by which theparallelism isobtained lies in the feature ,that'the pivotal connection of the beam Lwith the cross-head, the pivot K of the fulcrum-lever, and the pivot mlie in a straight line. As long as this feature of construction isretained the proportionate length of the links and lever-arm making up'the device can be considerably changed, it being necessary that theeffective length of the link N should be equal to the efiective lengthof thefnlcrum-lever and that the effeetivelength and of effective lengthequal to that of the of the connecting-link M should be equal to thedistance between the pivots 7c and 1.

Having now described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

In a combination With a steam-engine having a sliding cross-head, afulcrum-lever K K pivoted on the frame of the engine, a beam L L pivotedto one arm of the fulcrum-lever and connected at one end to thecross-head, a link N pivoted to the other end of the beam fulcrum-lever,a connecting-rod M pivoted to the arm. K of the fulcrum-lever, and tothe link N, the effective length of said rod being equal to theeffective length of the arm L of the beam, an air-pump and a pump-pistonconnected to link and rod N M.

GUSTAV BERNHARD PETSOHE.

Witnesses:

CHAS. F. MEYERS, D. STEWART.

